KAPLAN OFFICIAL EXPLANATIONRead the Original Sentence Carefully, Looking for Errors:
When the underlined portion contains a pronoun, check to make sure the pronoun clearly and unambiguously refers to a particular noun in the sentence and that it agrees in number and gender with that noun. Here, the pronoun “their” appears early in the underlined portion and can only be referring to "The research reports," the subject of the sentence. That noun is plural, so "their" is appropriate. It appears that there is no error in the original sentence. Check the other answer choices to make sure.
Scan and Group the Answer Choices:
A vertical scan of the choices reveals a 3-2 split: (A), (B), and (E) use the pronoun "their," while (C) and (D) use the pronoun "its."
Eliminate Wrong Answer Choices:
As noted, "research reports" is plural, so a plural pronoun is needed to replace it. (C) and (D) use the singular "its" and can therefore be eliminated.
(B) and (E) both insert "the fact" near the end, to read "suggest the fact that." This is simply superfluous language; it adds no additional meaning to the original "suggest that." The GMAT prefers concise language whenever possible, so eliminate (B) and (E).
The sentence is correct as written, so (A) is the answer.
TAKEAWAY: Look for the commonly tested errors, such as pronouns, but don't forget that (A) is correct 20% of the time. Don't try too hard to find errors that simply aren't there.